I mean, the start of this era should just be post COVID break - but the question is when you make a cutoff and call it a different one
Always up to debate when an era comes to an end and where a new one begins, if it's not a clear cut like the Indu era. To me, the Pogi-era already started pre COVID and his 2019 Vuelta display

But I think in relation to
@Rackham's text it was not so much about the 'era' as he excitement in noting that the four expected "era" riders are still current and still proving to be the strongest after 7 stages, when much else could have gone to waste, besides disappointments from one or more of the four.
I would say it is difficult to rule out Wonder Kid Evenepoel as part of the 'era' riders, although he is sub par speaking GT's, he is still in the game. And I'm almost certain we'll see spectacle from him before the really high mountains, where he'll try to do a lot of damage to his closest competitors with stronger climbing and descender skills.
It is in this light that I read the text.
(And not an endless irrelevant-to-the-thread discussion of eras. OK with me with such a discussion, but open a dedicated thread for that stuff, thx).